A simple example is the media sharing quality is horrendous when you transcend the iPhone/Android boundary. Can you communicate, yes. Is it as good as an all iMessage interaction, no.
Yup...my parents share videos from their iphone to my android and it is of a quality where you can literally count the pixels. Maybe there is a way to share higher quality, but they're not tech savvy and just do what is the default.
Maybe you could use any app asking WhatsApp, Telegram, Skype, Signal or even Messenger (is it still a thing?) They work well with video. WhatsApp wouldn't be running Europe if its videos were bad.
Telegram is by far the best one for video/photo quality because it doesn't do any (visible) compression, meanwhile WhatsApp and Messenger (yep, still exists) noticeably degrades the quality.
There is definitely a way to share higher quality, my feature phone could send better images and videos in 2010. EMS standards haven't gone away, apple just chooses not to use them because...
